The 3rd Frontiers in Organic Synthesis Technology” (FROST3) focusing on the “Progress in Flow Chemistry”, organized jointly by the Flow Chemistry Society and Akadémiai Kiadó Zrt. (a Wolters Kluwer company – publisher of the Journal of Flow Chemistry) was held in Budapest on the 11th–13th October 2011. 58 people attended from all over the world, and 11 internationally renowned speakers presented their latest results. Since the last conference held in 2009 we have witnessed a rapid development of flow chemistry technologies, both in the applications and the reactor design.